Skiving machine



March 18 1924.

L. G. MILLER SKIVING MACHINE Filed Feb. 27, 1920 Patented Mar. 1, 1924 LLOYD G. IVIILLER, OF BEVERLY, HLASSACHUSETTS, ASSIGNOB. TO UNITED SHOE MA- OHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SKIVIN'G MACHINE.

Application filed February 27, 1920. Serial No. 361,765.

T 0 all whom 2'2} may concern.

Be it known that I, LLOYD G. MILLER, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Skiving Machines; and I do hereby declare the follow ing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to skiving machines such as are utilized in skiving the edges of leather or other flexible material for use in the manufacture of boots or shoes orfor use in various arts.

The primary object of the invention is to provide means for feeding the stock to the skiving knife which will operate uniformly and efficiently without tendency to distort or displace the stock and which will not interfere with the manipulation of the stock requisite for skiving about the curves and angles which may occur along the edges of the articles being operated upon. To this end one feature of the invention contemplates the provision of an auxiliary roll arranged to cooperate with the feed roll at a point beyond that portion of its periphery which cooperates with the presser foot in presenting the stock to the knife edge and in determining the angle of the skiving. In order that the auxiliary roll may v press the stock against the feed roll at a point close to the edge of the knife it is dished or cupped to embrace or enclose the knife and thus enter the angle between the feed roll and the knife edge. Since the periphery of the auxiliary roll curves away from the periphery of the feed roll the leading edge of the stock may readily be introduced between the rolls and since the periphery of the axuiliary roll travels at a uniform speed in the direction of the feed it will have no tendency to wrinkle or distort the stock as it approaches or leaves the cutting plane. The line of contact between the auxiliary roll and the stock is comparatively short or approximating a point contact so that theswinging and manipulation of the stock by the operator is not materially interfered with. V

The invention also includes further features of construction and combinations of parts hereinafter described and set forth in the claims;

In the drawings Fig. 1 is a front elevation showing so much of a skiving machine as is necessary to illustrate the application of the present invention thereto; and Fig. 2 is a sectional end elevation on line 22, Fig. 1.

In the drawings the invention is shown as embodied in a machine having the general construction and mode of operation of the machine shown and described in Patent No. 1,169,060, January 18, 1916. In this machine the work is supported and fed to 2. cylindrical skiving knife 2 by a feed roll 4 arranged below the knife and having a portion of its periphery curved to correspond to the curvature of the knife. The lower edge of the knife is arranged to travel over the center of the feed roll and the knife is mounted to rotate about an axis which is inclined upwardly in the direction of the feed, as more fully shown and described in the patent above referred to. The edge portion of the work which is to be skived is pressed uniformly against the feed roll directly in front of the knife edge by a yielding presser foot 6 and the work is guided by an edge gage 8 against which the edge of the stock travels as it is fed against the knife edge. The feed roll is provided with a cylindrical end portion 10 smaller in diameter than the portion which cooperates with the knife edge and the stock is pressed against the reduced portion 10 of the roll by an auxiliary roll 16. The roll 16 is mounted in the forward end of an arm 18, the rear end of which is vmounted to swing and slide on a fixed stud 20, and the roll is pressed against the feed ,roll by a spring 22, the force of which may be adjusted by an adjusting screw 24.

In order that the roll 16 may engage the stock close to the portion 4 of the feed roll which cooperates with the knife edge the roll is dished or cupped to receive the knife 2. In the construction shown, the roll 16 is in the form of a hollow open ended cylinder of a size to enclose or embrace that portion of the knife 2 which is at one side of the cutting point. The edge of a roll of this character is well adapted to enter the angle between the edge of the knife and the periphery of the feed roll close up to the point where the knife enters the stock and is also well adapted for cooperation with the reduced end of the feed roll. The surface speed of a roll of this character is also uni form and. in the direction of feed througln pulley 52,

out that portion which engages or may come into contact with the stock, and the roll will have no tendency therefore to crowd or shift any portion of the stock laterally toward or away from the edge gage as the stock approaches or leaves the cutting plane and will have no tendency therefore to distort and displace the stock during the skiving. The surface of the roll in connection with the surface of the reduced portion 10 of the feed roll also forms a converging throat into which the leading end of the stock may be readily introduced.

The angle of the skiving is determined by the lateral position of the feed roll with relation to the knife edge and the position of the roll is varied to vary the angle of the skiving by longitudinal at.- justment of the roll carrying shaft 26. The means for thus adjusting the shaft con1 rises an ad'ustin screw 28 carrvin a.

sleeve 30 provided with a projecting arm 32 engaging a grooved collar 34 on the shaft. The adjusting screw 28 also carries an arm 36 the end of which is connected to one end of a rod 38, the other end of which is connected with the arm 18 so that the auxiliary roll 16 is moved with the feed roll 4 wheneverrthe feed roll is moved to vary the angle of the skiving. The rod 38 is formed in two parts connected by a turn buckle 4-0 which may be adjusted to. vary the position of the auxiliary roll 16 with relation to the feed roll found desirable The various rotary parts of the machine are all driven from a drive shaft 1-2 through suitable belts and pulleys. The feed roll 4. is driven from a pulley 44 on the drive shaft through a cross belt 46 passing about the guide pulley 48, about a pulley 50 connected with the shaft 26, and about a second guide the belt being crossed between the pulley 50 and the pulleys 48 and The knife 2 is driven through a belt -onnecting a pulley 06 on the knife shaft with a pulley 58 on a shaft til) which is drive from the shaft 42. through a belt The auxiliary roll 16 is driven from a pulley 64 on the shaft 42 through a belt 66 which. passes over the guide pulleys G8 and a pulley 70 on the roll shaft.-

While it is preferred to utilize the specific construction shown and described in embodying the invention in the machine of the patent above referred to. it will be under stood that this construction and arrangement isnot essential to the broader features of the invention and may be varied or inedilied as found desirable or best suited to the construction of the machine in which it is to be embodied.

What is claimed is:

1. A skiving machine having, in combination, a skiving knife, a prcsser feet, a feed roll having a portion of its periphery cooperating with the presser foot in resenting the stock to the edge of the knife and an auxiliary roll co-operating with the periphery of the feed roll and having its end dished to receive the skiving knife.

2. A. skiving machine having, in combination, a skiving knife, a presser foot, a feed roll having a portion of its periphery cooperating with the presser foot, and hollow open ended cylindrical-roll, the end of which co-operates with the periphery of the feed roll at a point close to said portion.

3. A skiving machine having, in combination, a cylindrical knife, a feed roll below the knife having a portion for presenting the stock to the knife edge, and a reduced end portion and a hollow cylindrical roll arranged to co-operate with the reduced end of the feed roll.

4. A skiving machine having, in combination, a skiving knife, a feed roll having a reduced end portion, an auxiliary roll co-' operating with the reduced end of the feed roll, a laterally movable arm in which the auxiliary roll is mounted, a rod connected with the arm, anendwise movable shaft for the feed roll, an adjusting screw, and arms carried by the screw and connected with the rod and shaft.

5. A skiving machine having, in coinbina tion, a cylindrical knife, a feed roll below the knife having a reduced end portion, an auxiliary roll the periphery of which co-operates with the reduced endof the feed roll and extending partly around. the knife, a drive shaft and. pulleys and belts through which motion is transmitted from the drive shaft to the knife, feed roll and auxiliary roll.

6. A skiving machine having, in combina tion, a skiving knife, :1 presser feet. a feed roll having a portion of its periphery cooperating with the presser foot in presenting the stock to the edge of the knife and ha *ing a reduced end portion and an auxiliary roll co-operating with the feed roll. and having its end dished to receive the skiving knifev LLOYD MILLER. 

